I don't think Lucasarts cares about the PC market anymore when they can produce console games that sell well. The effort that goes into making PC games these days.. and having to make it compatible with so many different systems scares most suits.
If there was ever to be an "X-wing" game that would work it would have to be hand in hand with the clone wars series that will be coming out. It also would have to have multi player and co-op support for a large campaign. XWA was set up for Co-op but TG never really had the time to fully implement it.. and the horrid net code practically killed any real Multiplayer chance
No I highly doubt Lucasarts would ever make another X-wing series game, and even if they did it wouldn't be anything near to something that was decent... they are most concerned about deadlines then about gameplay
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Official XWA flight instructor
get busy with it!